Manufacture of lustrous cellulose threads.



, I U ITED STATES PATENT OFFICE.

-, IRUDoLF L'INKMEIYER', OF BRUSSELS,I BELGIUM.

Specification of Letters Patent.

MANUFACTURE'OF L US T l =lOUS CELLULOS E THREADS. I I

' Patented Dec, 18, 1906.

Original application filed March 29, 1905, Serial No. 25 2,633. Divided and this application filed Mmh 22,1906. Serial No. 307,409

To all'whom it may cancer-m l Be it known thatI, RUDOLF, LINKMEYER, a subject of the German Emperor, residing at Brussels, Belgium, have invented new and useful Improvements in the Manufacture of,v Lustrous Cellulose Threads, of which the following is a specification. This ap 1 cation is a division of the aplplication led March 29, 1905,,fSerial' No. IIIOI, I s,

known that cellulose, dissolved in a cupro ammoniacal liquor may be precipi- 'tated in the form of threads by means of dilute sulfuric acid after the cellulosi'c'solution has beenthickened and assed throughsrnall apertures. The threa s obtained by this method are, however, too fragile to be industrially utilizable, as the action of the dilute (sulfuric acid produces a decomposition of the c l threads whi destroys their strength. In order, to obviate this defect, sulfuric acid in a highly- -concentrated state is usually ema ployed.

.25, threads bythe dilutesulfuric acid does not Now the present invention is based upon the discovery that the decompositionof the take place when the pro ortion of ammonia intlie cellulosic solution as been previously reduced byfthe actionof avacuum-orsby the injection of air. The cause of the decomposi- I tionwould' apfpear to consistin the fact that a large part 0 the solution after the cellulose has been dissolved. I

The presentinventiontherefore consists the ammonia becomes free in niacal solutionfrom which uncombined am monia has been previously extracted.

By-means of a solution of sulfuric acid of twenty per cent, for example, non-adherent threads are obtained which do not break during weaving and which may be rapidly drawn very finely. I

' Having now described my invention, what I claim as new, and desire to secure by Let ters Patent, isv 1'. A rocess trous ce ulosethreads, by means of a cuproammoniacal solution of cellulose, consisting in extracting a portion of the ammonia contained in said solution andin then causing {the same to pass in the form into a dilute acid.

2. A rocess for the manufacture of lustrous ce ulose threads, by means of a cuproammoniacal solution of cellulose, consisting in extracting a portion of the ammonia conthe latter to pass in the form of a very fine jet into a sulfuric-acid solution at twenty per centfor example.

signaturein'presence oftwo subscribing witnessesr v I I RU D. LINK MEYER,

' Witnesses: v I

, H. J. E. KIRKPATRICK,

recipitating, by means of dilute acid {the cel-- ulose-containedin a cellulosic cupro-ammo- In 'testimony'whereof I have affixed myv s tained in said-solution and in then causing I 

